Lens driving unit, camera module and optical apparatus

ABSTRACT

A lens driving device is provided, the lens driving device including: a housing; a bobbin disposed at an inner side of the housing; a first driving part disposed on the bobbin; a second driving part disposed on the housing and facing the first driving part; a first mounting part disposed on the bobbin; a second mounting part disposed on the bobbin and disposed at an opposite side of the first mounting part based on a center of the bobbin; a first magnet disposed on the first mounting part; a sensor part sensing a position of the first magnet; and a second magnet disposed on the second mounting part.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.15/142,610, filed Apr. 29, 2016; which claims priority under 35 U.S.C. §119 to Korean Patent Application Nos. 10-2015-0060353, filed Apr. 29,2015; 10-2015-0092589, filed Jun. 30, 2015; and 10-2015-0092590, filedJun. 30, 2015, all of which are hereby incorporated by reference intheir entirety.

TECHNICAL FIELD

Exemplary embodiments of the present disclosure relate to a lens drivingdevice, a camera module, and an optical apparatus.

BACKGROUND

Concomitant with wide propagation of various mobile terminals andcommercialization of wireless Internet services, demands by consumersrelated to the mobile terminals are diversified, and various types ofadditional equipment are attached to the mobile terminals.

Among the various types of additional equipment, a camera module may bea representative device capable of photographing an object as a stillimage or a moving picture.

Meanwhile, camera modules having AF (Auto Focus) functions are popularlyused. Here, an auto focus feedback is required to be used for moreprecise AF control.

However, the conventional camera module having the auto focus feedbackfunction suffers from disadvantages in that the sensing structure forsensing a position of a bobbin affects a posture of the bobbin togenerate a static tilt and a dynamic tilt.

BRIEF SUMMARY Technical Challenge

The present disclosure is to provide a lens driving device directed tosolve the aforementioned problems or disadvantages by comprising a firstmagnet for sensing a position of a bobbin and a second magnetestablishing magnetic force equilibrium with the first magnet.

In addition, the present disclose is to provide a camera module and anoptical apparatus including precise auto focus function and auto focusfeedback function using the lens driving device.

Technical problems to be solved by the present disclosure are notrestricted to the above-mentioned, and any other technical problems notmentioned so far will be clearly appreciated from the followingdescription by skilled in the art.

Technical Solution

An object of the present disclosure is to solve at least one or more ofthe above problems and/or disadvantages in whole or in part and toprovide at least the advantages described hereinafter.

In order to achieve at least the above objects, in whole or in part, andin accordance with the purposes of the present disclosure, as embodiedand broadly described, and in one general aspect of the presentdisclosure, there is provided a lens driving device, the camera modulecomprising: a housing; a bobbin disposed at an inner side of thehousing; a first driving part disposed on the bobbin; a second drivingpart disposed on the housing and facing the first driving part; a firstmounting part disposed on the bobbin; a second mounting part disposed onthe bobbin and disposed at an opposite side of the first mounting partbased on a center of the bobbin; a first magnet disposed on the firstmounting part; a sensor part sensing a position of the first magnet; anda second magnet disposed on the second mounting part.

In some exemplary embodiments, the sensor part may be disposed at thehousing, the second driving part may include a third magnet being spacedpart from the first magnet and the second magnet, and the sensor partand the third magnet may be disposed on a same plane of the housing.

In some exemplary embodiments, the bobbin may include a first outercircumferential surface, a second outer circumferential surface, and afirst edge part formed by encounter of the first outer circumferentialsurface and the second outer circumferential surface, the first magnetmay be disposed at the first outer circumferential surface, and thefirst magnet may be disposed biased to the first edge part.

In some exemplary embodiments, the bobbin may include a third outercircumferential surface facing the first outer circumferential surface,a fourth outer circumferential surface facing the second outercircumferential surface, and a second edge part formed by encounter ofthe third outer circumferential surface and the fourth outercircumferential surface, the second magnet may be disposed at the thirdouter circumferential surface, and the second magnet may be disposedbiased to the second edge part.

In some exemplary embodiments, the first magnet and the second magnetmay be spaced apart at a distance corresponding to a center of thebobbin.

In some exemplary embodiments, the center of the bobbin may be disposedon a virtual line connecting the first magnet and the second magnet.

In some exemplary embodiments, the first magnet and the second magnetmay be in shape and size corresponding to those of each other.

In some exemplary embodiments, the lens driving device may furthercomprise: a cover member, made of a metallic material, disposing thebobbin and the housing at an inner space; and a support memberelastically supporting the bobbin dynamically movable with respect tothe housing, wherein the first magnet and the second magnet may bespaced apart at a distance corresponding to the first driving part, thesecond driving part, the cover member, or the support member.

In some exemplary embodiments, the lens driving device may furthercomprise: a lower support member elastically connecting a lower part ofthe bobbin and a lower part of the housing, wherein the first drivingpart includes a coil, and the lower support member may be provided in apair, where each of the pair of the lower support member may beconnected to the coil so as to be supplied with electric power from anexternal source for delivery.

In some exemplary embodiments, the first mounting part may be formed bybeing recessed on an outer circumferential surface at one side of thebobbin, and the second mounting part may be formed by being recessed onan outer circumferential surface at another side of the bobbin.

In some exemplary embodiments, the first driving part and the firstmagnet may be disposed to avoid overlapping in a horizontal direction.

In some exemplary embodiments, the lens driving device may furthercomprise an adhesive bonding the first magnet to the first mountingpart.

In some exemplary embodiments, the housing may include a driving partcoupling part coupled with the second driving part and a sensor mountingpart disposed with the sensor part.

In some exemplary embodiments, the housing may include four lateralsurfaces, the driving part coupling part may be disposed one on each ofthe four lateral surfaces, and the driving part coupling part and thesensor mounting part may be disposed together on one lateral surfaceamong the four lateral surfaces of the housing.

In some exemplary embodiments, a size of the driving part coupling partdisposed on one lateral surface of the housing may be smaller than asize of the driving part coupling part disposed on another surfaceadjacent to the one lateral surface.

In some exemplary embodiments, the driving part coupling part disposedon one lateral surface of the housing may be disposed biased to an edgeformed by encounter of the one lateral surface and another lateralsurface.

In some exemplary embodiments, the lens driving device may furthercomprise: a flexible printed circuit board mounted with the sensor part;and a cover member disposing the bobbin and the housing at an innerspace, wherein the flexible printed circuit board may be disposedbetween the housing and the cover member.

In another general aspect of the present disclosure, there is provided alens driving device, the lens driving device comprising: a housing; abobbin disposed at an inner side of the housing; a driving coil disposedon the bobbin; a driving magnet disposed on the housing and facing thedriving coil; a first mounting part disposed on the bobbin; a secondmounting part disposed on the bobbin and disposed at an opposite side ofthe first mounting part based on a center of the bobbin; a sensingmagnet disposed on the first mounting part; a Hall sensor sensing aposition of the first magnet; and a compensating magnet disposed on thesecond mounting part, wherein the Hall sensor, the driving coil, and thesensing magnet may be overlapped.

In some exemplary embodiments, the camera module may further comprise: acontroller configured to move the bobbin with respect to the housing byapplying electric power to the driving coil, wherein the controller maycontrol the electric power applied to the driving coil by receiving aposition of the sensing magnet sensed by the Hall sensor.

In still another general aspect of the present disclosure, there isprovide an optical apparatus, the optical apparatus comprising: ahousing; a bobbin disposed at an inner side of the housing; a firstdriving part disposed on the bobbin; a second driving part disposed onthe housing and facing the first driving part; a first mounting partdisposed on the bobbin; a second mounting part disposed on the bobbinand disposed at an opposite side of the first mounting part based on acenter of the bobbin; a first magnet disposed on the first mountingpart; a sensor part sensing a position of the first magnet; and a secondmagnet disposed on the second mounting part.

In still another general aspect of the present disclosure, there isprovided a lens driving device, the lens driving device comprising: afirst driver including a first driving part and a bobbin disposed withthe first driving part; a second driver including a second driving partconfigured to move the first driving part through electromagneticinteraction with the first driving part, and a housing disposed with thesecond driving part; a third driving part configured to move the seconddriving part through electromagnetic interaction with the second drivingpart; a first magnet disposed at one side of the bobbin; a sensor partdisposed at the housing, and sensing a position of the first magnet; anda second magnet disposed at another side of the bobbin.

In some exemplary embodiments, the first magnet and the second magnetmay be disposed to avoid facing the second driving part.

In some exemplary embodiments, the housing may include a first lateralsurface, a second lateral surface adjacent to the first lateral surface,and a corner part formed by encounter of the first lateral surface andthe second lateral surface.

In some exemplary embodiments, the bobbin may include a first outercircumferential surface facing the first lateral surface, a second outercircumferential surface facing the second lateral surface, and a thirdcircumferential surface facing the corner part, wherein the first magnetmay disposed at the third outer circumferential surface.

In some exemplary embodiments, the housing may further include a thirdlateral surface adjacent to the second lateral surface.

In some exemplary embodiment, the second lateral surface may include afirst driving magnet disposed at the first lateral surface, a seconddriving magnet disposed at the second lateral surface, a third drivingmagnet disposed at the third lateral surface, wherein a separatingdistance between the first driving magnet and the second driving magnetis longer than a separating distance between the second driving magnetand the third driving magnet.

In some exemplary embodiments, the housing may include a first lateralsurface, a second lateral surface adjacent to the first lateral surface,and a corner part formed by encounter of the first lateral surface andthe second lateral surface.

In some exemplary embodiments, the bobbin may include a first outercircumferential surface facing the first lateral surface, a second outercircumferential surface facing the second lateral surface, and a thirdcircumferential surface facing the corner part, wherein the first magnetmay disposed at the third outer circumferential surface, and the firstmagnet may be disposed biased to the third outer circumferentialsurface.

In some exemplary embodiments, the second driving part may include afirst driving magnet disposed at the first lateral surface and a seconddriving magnet disposed at the second lateral surface, wherein the firstdriving magnet may be smaller than the second driving magnet.

In some exemplary embodiments, the first magnet may be spaced apart fromthe first driving part in a direction corresponding to an optical axisdirection of a lens module coupled at an inner side of the bobbin.

In some exemplary embodiments, the sensor part may be spaced apart fromthe second driving part in a direction corresponding to an optical axisdirection of a lens module coupled at an inner side of the bobbin.

In some exemplary embodiments, an orthographic projection of the firstmagnet toward the housing may not be overlapped with the second drivingpart.

In some exemplary embodiments, the first magnet may be disposed at anaccommodating groove formed on the bobbin.

In some exemplary embodiments, the accommodating groove may be of abottom-opening type or a top-opening type.

In some exemplary embodiments, the first magnet may have an N-pole andan S-pole disposed at an upper surface and a lower surface of the firstmagnet, respectively.

In some exemplary embodiments, the accommodating groove may be of atop-and-bottom closing type formed by a part of the outercircumferential surface internally recessed.

In some exemplary embodiments, the first magnet may have an N-pole andan S-pole disposed at lateral surfaces of the first magnet.

In some exemplary embodiments, the first magnet and the second magnetmay be spaced at a distance corresponding to a center of the bobbin.

In some exemplary embodiments, a center of the bobbin may be disposed ona virtual line connecting the first magnet and the second magnet.

In some exemplary embodiments, the first magnet and the second magnetmay be in shape and size corresponding to those of each other.

In some exemplary embodiments, the first magnet and the second magnetmay be disposed to establish a magnetic force equilibrium with eachother.

In still another general aspect of the present disclosure, there isprovided a camera module, the camera module comprising: a first driverincluding a first driving part and a bobbin disposed with the firstdriving part; a second driver including a second driving part configuredto move the first driving part through electromagnetic interaction withthe first driving part, and a housing disposed with the second drivingpart; a third driving part configured to move the second driving partthrough electromagnetic interaction with the second driving part; afirst magnet disposed at one side of the bobbin; a sensor part disposedat the housing, and sensing a position of the first magnet; and a secondmagnet disposed at another side of the bobbin.

In some exemplary embodiments, the first driving part may include acoil.

In some exemplary embodiments, the camera module may further comprise acontroller configured to move the first driver with respect to thesecond driver by applying electric power to the coil, wherein thecontroller may control the electric power applied to the coil byreceiving a position of the first magnet sensed by the sensor part.

In still another general aspect of the present disclosure, there isprovided an optical apparatus, the optical apparatus comprising: a mainbody, a display unit configured to display information by being arrangedat a surface of the main body, and a camera module configured tophotograph a picture or a motion picture by being installed at the mainbody, wherein the camera module may include: a first driver including afirst driving part and a bobbin disposed with the first driving part; asecond driver including a second driving part configured to move thefirst driving part through electromagnetic interaction with the firstdriving part, and a housing disposed with the second driving part; athird driving part configured to move the second driving part throughelectromagnetic interaction with the second driving part; a first magnetdisposed at one side of the bobbin; a sensor part disposed at thehousing, and sensing a position of the first magnet; and a second magnetdisposed at another side of the bobbin.

In still another general aspect of the present disclosure, there isprovided a lens driving device, the lens driving device comprising: afirst driver including a first driving part and a bobbin disposed withthe first driving part; a second driver including a second driving partconfigured to move the first driving part through electromagneticinteraction with the first driving part, and a housing disposed with thesecond driving part; and a third driving part configured to move thesecond driving part through electromagnetic interaction with the seconddriving part, wherein the second driving part may include a firstdriving magnet, a second driving magnet disposed neighboring to thefirst driving magnet, a third driving magnet disposed neighboring to thesecond driving magnet, and a fourth driving magnet disposed neighboringto the third driving magnet, wherein a size of the first driving magnetmay be different from a size of the second driving magnet.

In some exemplary embodiments, an encountering angle between a virtualline connecting a center of the first driving magnet to a center of thehousing and a virtual line connecting a center of the second drivingmagnet to a center of the housing may form an acute angle or an obtuseangle.

In some exemplary embodiments, a first separating distance between thefirst driving magnet and the second driving magnet may be different froma second separating distance between the second driving magnet and thethird driving magnet.

In some exemplary embodiments, the fourth driving magnet may be disposeddifferently from the first driving magnet and the third driving magnet,wherein a separating distance between the third driving magnet and thefourth driving magnet may correspond to the first separating distance,and a separating distance between the fourth driving magnet and thefirst driving magnet may correspond to the second separating distance.

In some exemplary embodiments, the first driving magnet may have athickness and a height same as those of the second driving magnet, andmay have a width different from that of the second driving magnet.

In some exemplary embodiments, the lens driving device may include afirst magnet disposed at one side of the bobbin; and a sensor partdisposed at the housing and sensing a position of the first magnet,wherein the first magnet may be disposed facing a first separating spaceforming the first separating distance, and the first separating distancemay be longer that the second separating distance.

In some exemplary embodiments, the first magnet may be disposed to avoidfacing the second driving part.

In some exemplary embodiments, the housing may include a first lateralsurface disposed with the first driving magnet, a second lateral surfacedisposed with the second driving magnet, and a corner part formed byencounter of the first lateral surface and the second lateral surface,wherein the first magnet may be disposed facing the corner part.

In some exemplary embodiments, the housing may include a first lateralsurface disposed with the first driving magnet, a second lateral surfacedisposed with the second driving magnet, and a corner part formed byencounter of the first lateral surface and the second lateral surface,wherein the first magnet may be disposed facing the corner part, and anorthographic projection of the first magnet toward the first lateralsurface may not be overlapped with the first driving magnet.

In some exemplary embodiments, the lens driving device may include asecond magnet disposed at another side of the bobbin.

In some exemplary embodiments, the first magnet and the second magnetmay be spaced apart at a distance corresponding to a center of thebobbin.

In some exemplary embodiments, the center of the bobbin may be disposedon a virtual line connecting the first magnet and the second magnet.

In some exemplary embodiments, the first magnet and the second magnetmay be in shape and size corresponding to those of each other.

In some exemplary embodiments, the first magnet and the second magnetmay be disposed to establish a magnetic force equilibrium or a weightequilibrium with each other.

In still another general aspect of the present disclosure, there isprovided a camera module, the camera module comprising: a first driverincluding a first driving part and a bobbin disposed with the firstdriving part; a second driver including a second driving part configuredto move the first driving part through electromagnetic interaction withthe first driving part, and a housing disposed with the second drivingpart; and a third driving part configured to move the second drivingpart through electromagnetic interaction with the second driving part,wherein the second driving part may include a first driving magnet, asecond driving magnet disposed neighboring to the first driving magnet,a third driving magnet disposed neighboring to the second drivingmagnet, and a fourth driving magnet disposed neighboring to the thirddriving magnet, wherein a size of the first driving magnet may bedifferent from a size of the second driving magnet.

In some exemplary embodiments, a first separating distance between thefirst driving magnet and the second driving magnet may be different froma second separating distance between the second driving magnet and thethird driving magnet.

In some exemplary embodiments, the camera module may include a firstmagnet disposed at one side of the bobbin; and a sensor part disposed atthe housing and sensing a position of the first magnet, wherein thefirst magnet may be disposed facing a first separating space forming thefirst separating distance, and the first separating distance may belonger that the second separating distance.

In some exemplary embodiments, the first driving part may include acoil.

In some exemplary embodiments, the camera module may further comprise acontroller configured to move the first driver with respect to thesecond driver by applying electric power to the coil, wherein thecontroller may control the electric power applied to the coil byreceiving a position of the first magnet sensed by the sensor part.

In still another general aspect of the present disclosure, there isprovided an optical apparatus, the optical apparatus comprising: a mainbody, a display unit configured to display information by being arrangedat a surface of the main body, and a camera module configured tophotograph a picture or a motion picture by being installed at the mainbody, wherein the camera module may include: a first driver including afirst driving part and a bobbin disposed with the first driving part; asecond driver including a second driving part configured to move thefirst driving part through electromagnetic interaction with the firstdriving part, and a housing disposed with the second driving part; and athird driving part configured to move the second driving part throughelectromagnetic interaction with the second driving part, wherein a sizeof the first driving magnet may be different from a size of the seconddriving magnet.

Advantageous Effect

Precise AF (Auto Focus) function, OIS (Optical Image Stabilization)function, AF feedback function, and/or OIS feedback function can beprovided in some exemplary embodiments of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating a lens driving deviceaccording to an exemplary embodiment of the present disclosure.

FIG. 2 is an exploded perspective view illustrating a lens drivingdevice according to an exemplary embodiment of the present disclosure.

FIG. 3 is a bottom view illustrating a lens driving device according toan exemplary embodiment of the present disclosure.

FIG. 4 is an exploded perspective view illustrating a bobbin andassociated structure of a lens driving device according to an exemplaryembodiment of the present disclosure.

FIG. 5 is an exploded perspective view illustrating a housing andassociated structure of a lens driving device according to an exemplaryembodiment of the present disclosure.

FIG. 6 is a graph illustrating an effect of a lens driving deviceaccording to an exemplary embodiment of the present disclosure.

FIG. 7 is a perspective view illustrating a lens driving deviceaccording to an exemplary embodiment of the present disclosure.

FIG. 8 is an exploded perspective view illustrating a lens drivingdevice according to an exemplary embodiment of the present disclosure.

FIG. 9 is a plan view illustrating some parts of a lens driving deviceaccording to an exemplary embodiment of the present disclosure.

FIG. 10 is a plan view illustrating a lens driving device of FIG. 9 witha housing being omitted.

FIG. 11 is a sectional view in a direction of L1-L2 line of FIG. 7.

FIG. 12 is a conceptual view illustrating a lens driving deviceaccording to an exemplary embodiment and a modified exemplary embodimentof the present disclosure.

DETAILED DESCRIPTION

Hereinafter, exemplary embodiments of the present disclosure will bedescribed with reference to the exemplary drawings. In designatingelements in the drawings as reference numerals, wherever possible, thesame reference numerals are used to refer to the same element, eventhough the same elements are illustrated in different drawings. Inaddition, in describing exemplary embodiments of the present disclosure,when it is determined that a detailed description about known functionor structure relating to the present disclosure may disturbunderstanding of exemplary embodiments of the present disclosure, thedetailed description may be omitted.

In addition, in describing elements of exemplary embodiments of thepresent disclosure, the terms such as “first”, “second” “A”, “B”, “(a)”and “(b)” may be used. However, such terms are used merely todistinguish a particular element from another element, and therefore,essence, order or sequence of the relevant elements shall not be limitedby the terms. It will be understood that when an element is referred toas being “connected”, “contacted” or “coupled” to another element, itcan be directly connected, contacted or coupled to the other elements,or otherwise, an intervening elements may be “connected”, “contacted” or“coupled” between the element and the other element.

As used herein, the term “PCB” is an acronym for “Printed CircuitBoard”, and the term “FPCB” is an acronym for “Flexible Printed CircuitBoard”.

Hereinafter, a structure of an optical apparatus according to anexemplary embodiment of the present disclosure will be described.

An optical apparatus according to an exemplary embodiment of the presentdisclosure may be any one of a mobile phone, a smart phone, a portablesmart device, a digital camera, a laptop computer, a digitalbroadcasting device, a PDA (Personal Digital Assistant), a PMP (PortableMultimedia Player), and a navigation device, but not limited hereto.Thus, any kind of device to photograph a picture or motion picture maybe the optical apparatus.

The optical apparatus according to an exemplary embodiment of thepresent disclosure may include a main body (not illustrated), a displayunit (not illustrated) configured to display information by beingarranged at a surface of the main body, and a camera (not illustrated)including a camera module (not illustrated) configured to photograph apicture or a motion picture by being installed at the main body.

Hereinafter, a structure of the camera module will be described.

The camera module may further include a lens driving device (10), a lensmodule (not illustrated), an infrared cut-off filter (not illustrated),a PCB (Printed Circuit Board) (not illustrated), an image sensor (notillustrated), and a controller (not illustrated).

The lens module may include at least one lens (not illustrated) and alens barrel accommodating the at least one lens. However, one structureof the lens module is not limited to the lens barrel, but any kind ofholder structure capable of supporting the at least one lens may beavailable. The lens module may move along with a lens driving device(10) by being coupled to the lens driving device (10). As an example,the lens module may be screw-coupled to the lens driving device (10). Asanother example, the lens module may be coupled to the lens drivingdevice (10) using an adhesive (not illustrated). As still anotherexample, the lens module may be coupled to an inner side of the lensdriving device (10). Meanwhile, light that has passed through the lensmodule may be irradiated to an image sensor.

The infrared cut-off filter may block light in an infrared area frombeing incident on the image sensor. As an example, the infrared cut-offfilter may be disposed between the lens module and the image sensor. Theinfrared cut-off filter may be installed at a base (500) to be describedhereinafter. The infrared cut-off filter may be coupled to a holdermember (not illustrated). The infrared cut-off filter may be installedat a center hole (510) formed on a center portion of the base (500). Asan exemplary embodiment, the infrared cut-off filter may be formed of afilm material or a glass material. Meanwhile, as an exemplaryembodiment, the infrared cut-off filter may be formed by a process wherea kind of infrared cut-off coating material is coated on a flat opticalfilter such as a cover glass for image plane protection.

The PCB (Printed Circuit Board) may support the lens driving device(10). The image sensor may be mounted on the PCB. As an example, thelens driving device (10) may be disposed at an outer side of an uppersurface of the PCB, and the image sensor may be disposed at an externalside of an upper surface of the PCB. Through such structure, the lightthat has passed through the lens module coupled at an inner side of thelens actuating unit may be irradiated to the image sensor mounted on thePCB. The PCB may supply electric power to the lens driving device(1010). Meanwhile, a controller for controlling the lens driving device(1010) may be disposed at the printed circuit board.

The image sensor may be mounted on the PCB. The image sensor may bedisposed to have the same optical axis with the lens module. Throughsuch structure, the image sensor may obtain the light that has passedthrough the lens module. The image sensor may output the irradiatedlight as a picture. As an example, the image sensor may be any one of aCCD (charge coupled device), an MOS (metal oxide semi-conductor), a CPD(charge priming device) and a CID (charge injection device), but notlimited hereto.

The controller may be mounted on the printed circuit board. Thecontroller may be disposed at an external side of the lens drivingdevice (10). Alternatively, controller may be disposed at an internalside of the lens driving device (10). The controller may controldirection, intensity and amplitude of electrical current supplied toeach structural element forming the lens driving device (10). Thecontroller may control the lens driving device (10) to perform at leastany one of AF (Auto Focus) function or OIS (Optical Image Stabilization)function of the camera module. That is, the controller may control thelens driving device (10) to move the lens module in an optical axisdirection or in a direction perpendicular to the optical axis direction,or to tilt the lens module. Furthermore, the controller may performfeedback control of the AF function and the OIS function. In particular,the controller may receive a position of a first magnet (710) sensed bya sensor part (730) to control electric power applied to a first drivingpart (220) or a second driving part (320).

Hereinafter, a structure of the lens driving device (10) will bedescribed in detail with reference to the enclosed drawings.

FIG. 1 is a perspective view illustrating a lens driving deviceaccording to an exemplary embodiment of the present disclosure; FIG. 2is an exploded perspective view illustrating a lens driving deviceaccording to an exemplary embodiment of the present disclosure; FIG. 3is a bottom view illustrating a lens driving device according to anexemplary embodiment of the present disclosure; FIG. 4 is an explodedperspective view illustrating a bobbin and associated structure of alens driving device according to an exemplary embodiment of the presentdisclosure; and FIG. 5 is an exploded perspective view illustrating ahousing and associated structure of a lens driving device according toan exemplary embodiment of the present disclosure.

Referring FIGS. 1 through 5, the lens driving device (10) according toan exemplary embodiment of the present disclosure may include a covermember (100), a driver (200), a stator (300), a base (500), a supportmember (600), and a sensing unit (700). Alternatively, at least one ofthe cover member (100), the driver (200), the stator (300), the base(500), the support member (600), and the sensing unit (700) may beomitted in the lens driving device (10) according to an exemplaryembodiment of the present disclosure.

The cover member (100) may form an external appearance of the lensdriving device (10). For example, the cover member (100) may be formedin a shape of a hexahedron of which lower portion is opened, but notlimited hereto. The cover member (100) may include an upper surface(101) and a lateral surface (102) extended downward form an outer sideof the upper surface (101). Meanwhile, the cover member (100) may beinstalled at an upper portion of the base (500). The driver (200), thestator (300), and the support member (600) may be disposed at aninternal space formed by the cover member (100) and the base (500). Inaddition, the cover member (100) may be coupled to the base (500) withan inner lateral surface of the cover member (100) closely adhered to apart or a whole of a lateral surface of the base (500). Through thisstructure, the cover member (100) may protect internal components fromexternal impacts and inhibit penetration of external pollutants as well.

The cover member (100) may be formed of metallic material. Inparticular, the cover member (100) may be provided as a metallic plate.In this case, the cover member (100) may block electronic interference.That is, the cover member (100) may block electromagnetic wave generatedoutside of the lens driving device (10) from being introduced in thecover member (100). In addition, the cover member (100) may blockelectromagnetic wave generated inside of the lens driving device (10)from being released out of the cove member (100). However, the materialforming the cover member (100) is not limited hereto.

The cover member (100) may include an opening (110) formed on an uppersurface and exposing the lens module. The opening (110) may be formed ina shape corresponding to that of the lens module. That is, the lightincident through the opening (110) may pass through the lens module.Meanwhile, the light that has passed through the lens module may bedelivered to the image sensor.

The driver (200) may include a bobbin (210) and a first driving part(220). The driver (200) may be coupled to a lens module that is acomponent of a camera module. That is, the lens module may be disposedat an inner side of the driver (200). In other words, an innercircumferential surface of the driver (200) may be couple to an outercircumferential surface of the lens module. Meanwhile, the driver (200)may dynamically move integrally with the lens module through aninteraction with the stator (300). That is, the driver (200) may movethe lens module.

The driver (200) may include a bobbin (210). In addition, the driver(200) may include a first driving part (220) coupled to the bobbin(210).

The bobbin (210) may be coupled to the lens module. In particular, anouter circumferential surface of the lens module may be coupled to aninner circumferential surface of the bobbin (210). Meanwhile, the firstdriving part (220) may be coupled to the bobbin (210). In addition, alower portion of the bobbin (210) may be coupled to a lower supportmember (620), and an upper portion of the bobbin (210) may be coupled toan upper support member (610). The bobbin (210) may be disposed at aninner side of the housing (310). The bobbin (210) may dynamically moverelative to the housing (310).

The bobbin (210) may include a lens coupling part (211) formed at aninner side of the bobbin (210). The lens module may be coupled to thelens coupling part (211). A screw thread may be formed on an innercircumferential surface of the lens coupling part (211), in a shapecorresponding to that of a screw thread formed on an outercircumferential surface of the lens module. That is, the outercircumferential surface of the lens module may be coupled to the innercircumferential surface of the lens coupling part (211).

The bobbin (210) may include a driving part coupling part (212) guidingthe first driving part (220) to be wound or installed. The driving partcoupling part (212) may be integrally formed with an outer lateralsurface of the bobbin (210). In addition, the driving part coupling part(212) may be formed consecutively along an outer circumferential surfaceof the bobbin (210). Alternatively, the driving part coupling part (212)may be formed by being spaced at a predetermined interval along an outercircumferential surface of the bobbin (210).

The driving part coupling part (212) may include a recessed part formedby a part of an outer lateral surface of the bobbin (210) beingrecessed. Meanwhile, the driving part coupling part (212) may include astaircase part formed by the recessed part. The first driving part (220)may be disposed at the recessed part. The first driving part (220)disposed at the recessed part may be supported by the staircase part tobe fixed.

The bobbin (210) may include an upper coupling part (213) coupled to anupper support member (610). The upper coupling part (213) may be coupledto an inner coupling part (615) of the upper support member (610). As anexample, the upper coupling part (213) provided as a protrusion may becoupled by being inserted in the inner coupling part (625) provided as agroove. Meanwhile, a protrusion may be provided at the upper supportmember (610) and a groove may be formed at the bobbin (210), and thesetwo components may be couple to each other.

As illustrated in FIG. 2, the bobbin (210) may include total four uppercoupling part (213). Meanwhile, the bobbin (210) may include a lowercoupling part (214) coupled to the lower support member (620). The lowercoupling part (214) formed at the lower portion of the bobbin (210) maybe coupled to the inner coupling part (625) of the lower support member(620). According to an exemplary embodiment of the present disclosure,the lower coupling part (214) provided as a protrusion may be coupled bybeing inserted in the inner coupling part (625) that is provided as agroove.

The first driving part (220) may be disposed facing the second drivingpart (320) of the stator (300). The first driving part (220) may movethe bobbin (210) with respect to the housing (310), throughelectromagnetic interaction with the second driving part (320). Thefirst driving part (220) may include a coil. The coil may be wound on anouter surface of the bobbin (210), by being guided by the driving partcoupling part (212).

In addition, the coil may include four independent coils, of which twoadjacent coils may form a 90 degree angle to be arranged at an outersurface of the bobbin (210). In a case where the first driving part(220) includes a coil, the electric power supplied to the coil may besupplied through the lower support member (620). Here, the lower supportmember (620) may be separately provided in a pair. Meanwhile, the firstdriving part (220) may include a pair of lead cables (not illustrated)for electric power supply. In this case, each of the pair of lead cablesmay be respectively coupled to the pair of the lower support members(620). Meanwhile, an electromagnetic field may be formed around thecoil, when the electric power is supplied to the coil. In addition, thefirst driving part (220) may include a magnet. In such case, the seconddriving part (320) may be provided as a coil.

The stator (300) may be disposed at an outer side of the driver (200) byfacing the driver (200). The stator (300) may be supported by the base(500) disposed at a lower side. The stator (300) may be disposed at aninternal space of the cover member (100).

The stator (300) may include a housing (310) disposed at an outer sideof the bobbin (210). In addition, the stator (300) may include a seconddriving part (320) that is disposed facing the first driving part (220)and fixed to the housing (310).

The housing (310) may be formed in shape corresponding to an innerlateral surface of the cover member (100) forming an external appearanceof the lens driving device (10). In addition, the housing (310) may beformed of an insulated material, and may be implemented as an injectionmolding material, in consideration of productivity. The housing (310)may be arranged to be spaced apart at a predetermined distance from thecover member (100), as a movable component for OIS (Optical ImageStabilization) operation.

Alternatively, in the AF (Auto Focus) model, the housing (310) may befixed on the base (500). In addition, in the AF model, the housing (310)may be omitted, and a magnet operating as the second driving part (320)may be fixed to the cover member (100).

In addition, upper and lower sides of the housing (310) may be opened toaccommodate the driver (200) movable in up/downward directions. Thehousing (310) may internally include an inner space (311), where upperand lower sides of the inner space (311) are opened. The driver (200)may be movably disposed at the inner space (311). That is, the innerspace (311) may be provided in a shape corresponding to a shape of thedriver (200). In addition, an outer circumferential surface of the innerspace (311) may be disposed spacing apart from an outer circumferentialsurface of the driver (200).

The housing (310) may include a driving part coupling part (312) at alateral surface of the housing (310), where the driving part couplingpart (312) may be formed in a shape corresponding to a shape of thesecond driving part (320) to accommodate the second driving part (320).That is, the driving part coupling part (312) may accommodate the seconddriving part (320) and fix the second driving part (320). Meanwhile, thedriving part coupling part (312) may be disposed on an innercircumferential surface or an outer circumferential surface of thehousing (310).

In the camera module according to an exemplary embodiment of the presentdisclosure, as illustrated in FIGS. 2 and 5, the driving part couplingpart (312) of the housing (310) may include four driving part couplingparts (312 a, 312 b, 312 c, 312 d). The housing (310) may four lateralsurfaces, and the four of the driving part coupling parts (312 a, 312 b,312 c, 312 d) may be disposed on the four lateral surfaces,respectively.

Meanwhile, the driving part coupling part (312) and the sensor mountingpart (740) may be disposed together on one lateral surface of thehousing (310). Here, a size of the driving part coupling part (312)disposed on one lateral surface of the housing (310) may be smaller thana size of the driving part coupling part (312) disposed on anothersurface adjacent to the one lateral surface. Meanwhile, the driving partcoupling part (312) disposed on one lateral surface of the housing (310)may be disposed biased to an edge formed by encounter of the one lateralsurface and another lateral surface.

The driving part coupling part (312) of the housing (310) may include afirst driving part coupling part (312 a), a second driving part couplingpart (312 b), a third driving part coupling part (312 c), and a fourthdriving part coupling part (312 d).

A first driving magnet (321) may be coupled to the first driving partcoupling part (312 a), a second driving magnet (322) may be coupled tothe second driving part coupling part (312 b), a third driving magnet(323) may be coupled to the third driving part coupling part (312 c),and a fourth driving magnet (324) may be coupled to the fourth drivingpart coupling part (312 d).

Meanwhile, the first driving part coupling part (312 a) and the seconddriving part coupling part (312 b) may be disposed facing each other,and the third driving part coupling part (312 c) and the fourth drivingpart coupling part (312 d) may be disposed facing each other.

In addition, the first driving part coupling part (312 a) and the seconddriving part coupling part (312 b) may be disposed symmetrical to eachother based on a center of the housing (310), and the third driving partcoupling part (312 c) and the fourth driving part coupling part (312 d)may be disposed symmetrical to each other based on a center of thehousing (310).

Furthermore, the first driving part coupling part (312 a) and the seconddriving part coupling part (312 b) may have a shape corresponding toeach other, and the third driving part coupling part (312 c) and thefourth driving part coupling part (312 d) may have a shape correspondingto each other.

However, in some exemplary embodiments, as illustrated in FIG. 2, thefirst driving part coupling part (312 a) and the third driving partcoupling part (312 b) may be provided in shapes different from eachother, respectively.

In addition, the third driving part coupling part (312 c) and the fourthdriving part coupling part (312 d) may be disposed biased to one side.Through this structure, the sensor part (730) sensing the first magnet(710) may secure a fixed position on the housing (310).

The upper support member (610) may be coupled to an upper portion of thehousing (310), and the lower support member (620) may be coupled to alower portion of the housing (310). The housing (310) may include anupper coupling part (313) coupled to the upper support member (610).

The upper coupling part (313) may be coupled to an outer coupling part(614) of the upper support member (610). According to an exemplaryembodiment of the present disclosure, the upper coupling portion (1313)provided as a protrusion may be coupled by being inserted in the outercoupling part (614) provided as a groove. Meanwhile, a protrusion may beprovided at the upper support member (610), and a groove may be providedat the housing (310), such that these two components can be coupled toeach other.

Meanwhile, the housing (310) may include a lower coupling part (notillustrated) coupled to the lower support member (620). The lowercoupling part formed at a lower portion of the housing (310) may becoupled to an outer coupling part (624) of the lower support member(620). According to an exemplary embodiment of the present disclosure,the lower coupling part provided as a protrusion may be coupled by beinginserted in the outer coupling part (614) provided as a groove.

According to an exemplary embodiment of the present disclosure, thehousing (310) may take a quadrilateral shape when viewed from the above.Here, a recessed part (314) may be disposed on an edge formed byencounter of adjacent corners of the quadrilateral housing (310).

That is, the housing (310) may include a recessed part (314) disposed onthe edge. The recessed part (314) may be recessed to provide a spacewhere an extended part (520) of the base (500) can be located. Therecessed part (314) may be provided in a shape corresponding to that ofthe extended part (520) of the base (500).

In some exemplary embodiments, an adhesive (not illustrated) may beprovided between the recessed part (314) and the extended part (520)such that these two components can be fixed to be coupled, when the lensdriving device (10) is provided as an AF model such that the housing(310) is not required to dynamically move.

Alternatively, a damper (not illustrated) may be provided between therecessed part (314) and the extended part (520) such that the resonancegenerated from the lens driving device (10) can be alleviated, when thelens driving device (10) is provided as an OIS model such that fluidityof the housing (310) is required to be secured.

The housing (310) may include a stopper (315) protrusively formed towardan upper direction. The stopper (315) may absorb impacts by contacting alower side of an upper surface of the cover member (100) when anexternal shock occurs. According to an exemplary embodiment of thepresent disclosure, as illustrated in FIG. 2, each of the stoppers (315)may be provided at each of four edges, but not limited hereto.Meanwhile, the stopper (315) may be integrally formed with the housing(310).

The second driving part (320) may be disposed facing to the firstdriving part (220) of the driver (200). The second driving part (320)may move the first driving part (220) through electromagneticinteraction with the first driving part (220). The second driving part(320) may include a magnet. The magnet may be fixed at the driving partcoupling part (312) of the housing (310).

According to an exemplary embodiment of the present disclosure, asillustrated in FIG. 2, four independent magnets (321, 322, 323, 324) maybe independently provided and arranged at the housing (310), where twoadjacent magnets may form a 90 degree angle with each other. That is,the second driving part (320) may be arranged at four edges inside ofthe housing (310) at a same interval, aiming to efficient use ofinternal volume. In addition, the second driving part (320) may adhereto the housing (310) using such as an adhesive, but not limited hereto.Meanwhile, the first driving part (220) may include a magnet, and thesecond driving part (320) may be provided as a coil.

According to an exemplary embodiment of the present disclosure, thesecond driving part (320) may include four driving magnets (321, 322,323, 324). That is, the second driving part (320) may include a firstdriving magnet (321), a second driving magnet (322), a third drivingmagnet (323), and a fourth driving magnet (324).

Here, the first driving magnet (321) may be coupled to the first drivingpart coupling part (312 a), the second driving magnet (322) may becoupled to the second driving part coupling part (312 b), the thirddriving magnet (323) may be coupled to the third driving part couplingpart (312 c), and the fourth driving magnet (324) may be coupled to thefourth driving part coupling part (312 d).

Meanwhile, the first driving magnet (321) and the second driving magnet(322) may be disposed facing each other, and the third driving magnet(323) and the fourth driving magnet (324) may be disposed facing eachother.

In addition, the first driving magnet (321) and the second drivingmagnet (322) may be disposed symmetrical to each other based on a centerof the housing (310), and the third driving magnet (323) and the fourthdriving magnet (324) may be disposed symmetrical to each other based ona center of the housing (310).

Furthermore, the first driving magnet (321) and the second drivingmagnet (322) may have a shape corresponding to each other, and the thirddriving magnet (323) and the fourth driving magnet (324) may have ashape corresponding to each other.

However, in some exemplary embodiments, as illustrated in FIG. 2, thefirst driving magnet (321) and the third driving magnet (323) may beprovided in shapes different from each other, respectively.

In addition, the third driving magnet (323) and the fourth drivingmagnet (324) may be disposed biased to one side from one surface of thehousing (310). Through this structure, the sensor part (730) sensing thefirst magnet (710) may secure a fixed position on the housing (310).

The base (500) may support the stator (300). A printed circuit board maybe disposed at a lower side of the base (500). The base (500) mayinclude a center hole (510) formed at a position corresponding to thatof the lens coupling part (211) of the bobbin (210). The base (500) mayfunction as a sensor holder protecting the image sensor. Meanwhile, thebase (500) may be provided in order to dispose an infrared ray filter.The infrared ray filter may be coupled to the center hole (510) of thebase (500).

According to an exemplary embodiment of the present disclosure, the base(500) may further include a foreign material collecting part (notillustrated) for collecting foreign materials introduced in the covermember (100). The foreign material collecting part may be disposed on anupper surface of the base (500) and may include an adhesive material,such that the foreign material collecting part can collect foreignmaterials in the inner space formed by the cover member (100) and thebase (500).

The support member (600) may connect the driver (200) and the stator(300). The support member (600) may elastically connect the driver (200)and the stator (300) such that the driver (200) can relatively anddynamically move with respect to the stator (300). That is, the supportmember (600) may be provided as an elastic member. According to anexemplary embodiment of the present disclosure, as illustrated in FIG.2, the support member (600) may include the upper elastic member (610)and the lower elastic member (620).

According to an exemplary embodiment of the present disclosure, theupper support member (610) may include an outer part (611), an innerpart (612), and a connecting part (613). The upper elastic member (610)may include the outer part (611) coupled to the housing (310), the innerpart (612) coupled to the bobbin (210), and the connecting part (613)elastically connecting the outer part (611) and the inner part (612).

The upper support member (610) may be connected to an upper portion ofthe driver (200) and to an upper portion of the stator (300). Inparticular, the upper support member (610) may be coupled to an upperportion of the bobbin (210) and to an upper portion of the housing(310). The upper support member (610) may include an outer coupling part(614) and an inner coupling part (615). The inner coupling part (615) ofthe upper support member (610) may be coupled to the upper coupling part(213) of the bobbin (210), and the outer coupling part (614) of theupper support member (610) may be coupled to the upper coupling part(313) of the housing (310).

According to an exemplary embodiment of the present disclosure, thelower support member (620) may include a pair of lower support members(620 a, 620 b). That is, the lower support member (620) may include afirst lower support member (620 a) and a second lower support member(620 b). Each of the first lower support member (620 a) and the secondlower support member (620 b) may be connected to each of a pair of leadwires of the first driving part (220) provided as a coil, so as tosupply electric power. Meanwhile, a pair of the lower support member(620) may be electrically connected to the circuit board (750). Throughthis structure, the pair of the lower support member (620) may supplywith electric power supplied from the circuit board (750) to the firstdriving part (220).

According to an exemplary embodiment of the present disclosure, thelower support member (620) may include an outer part (621), an innerpart (622), and a connecting part (623). The lower elastic member (620)may include the outer part (621) coupled to the housing (310), the innerpart (622) coupled to the bobbin (210), and the connecting part (623)elastically connecting the outer part (621) and the inner part (622).

The lower support member (620) may be connected to a lower portion ofthe driver (200) and to a lower portion of the stator (300). Inparticular, the lower support member (620) may be coupled to a lowerportion of the bobbin (210) and to a lower portion of the housing (310).The lower support member (620) may include an outer coupling part (624)and an inner coupling part (625). The inner coupling part (625) of thelower support member (620) may be coupled to the lower coupling part(214) of the bobbin (210), and the outer coupling part (624) of thelower support member (620) may be coupled to the lower coupling part(314) of the housing (310).

The sensing unit (700) may be used for AF (Auto Focus) feedback and/orOIS (Optical Image stabilization) feedback. That is, the sensing unit(700) may sense a position or movement of at least one of the driver(200) and the stator (300).

According to an exemplary embodiment of the present disclosure, thesensing unit (700) may include a first magnet (710), a first mountingpart (720), a sensor part (730), a sensor mounting part (740), and acircuit board (750). Here, the first magnet (710) may also be referredto as a sensing magnet, because the first magnet (710) is a magnet thatis sensed by the sensor part (730).

The first magnet (710) may be disposed at the driver (200). Inparticular, the sensing magnet (710) may be disposed at the bobbin(210). Furthermore, the first magnet (710) may be disposed at a firstmounting part (720) disposed on an outer circumferential surface of thebobbin (210). According to an exemplary embodiment of the presentdisclosure, the first magnet (710) may be mounted at the first mountingpart (720) that is disposed by being recessed more than the driving partcoupling part (212) formed by being recessed on an outer circumferentialsurface of the bobbin (210). In this case, the first magnet (710) may bedisposed between the first driving part (220) and the bobbin (210).Here, the first driving part (220) and the first magnet (710) may bedisposed to avoid overlapping in a horizontal direction, in order tominimize interaction between the first driving part (220) and the firstmagnet (710).

The first magnet (710) may be mounted at the first mounting part (720).The first mounting part (720) may be formed on an outer circumferentialsurface of the bobbin (210). The first mounting part (720) may be formedby being recessed more than the driving part coupling part (212) formedby being recessed on an outer circumferential surface of the bobbin(210). An adhesive may be coated between the first mounting part (720)and the first magnet (710), such that the first magnet (710) can befixed to the first mounting part (720). The first mounting part (720)may take a shape where at least one side among top, bottom, and lateralsides is opened. In addition, the first mounting part (720) may beformed such that only one surface among six surfaces of the first magnet(710) can be opened.

The sensor part (730) may be disposed facing to the first magnet (710).The sensor part (730) may sense a position of the first magnet (710).According to an exemplary embodiment of the present disclosure, thesensor part (730) may include a Hall sensor sensing magnetic force ofthe first magnet (710). The sensor part (730) may be disposed at thesensor mounting part (740). That is, the sensor part (730) may bedisposed on the housing (310). The sensor part (730) may be connected tothe circuit board (750).

The sensor mounting part (740) may be disposed at the housing (310). Thesensor mounting part (740) may be provided to penetrate through alateral surface of the housing (310). Through this structure, onesurface of the sensor part (730) disposed at the sensor mounting part(740) may face the first magnet (710) and another surface of the sensorpart (730) may be coupled to the circuit board (750). The sensormounting part (740) may be provided in a shape corresponding to that ofthe sensor part (730). According to an exemplary embodiment of thepresent disclosure, the sensor mounting part (740) may be disposed on alateral surface of the housing (310) where the fourth driving partcoupling part (312 d) is located.

The circuit board (750) may be connected to the sensor part (730) so asto supply electric power to the sensor part (730) from external sourcesand to transmit/receive information. That is, the sensor part (730) maybe mounted on the circuit board (750). According to an exemplaryembodiment of the present disclosure, the circuit board (750) may bedisposed between the housing (310) and the cover member (100). Thecircuit board (750) may include an FPCB (Flexible Printed CircuitBoard). In addition, the circuit board (750) may include a terminal part(751) connected to external source and configure to transmit/receive atleast one of electric power and information.

The second magnet part (800) may include a second magnet (810) and asecond mounting part (820). Here, the second magnet (810) may be alsoreferred to as a symmetrical magnet or a compensating magnet, becausethe second magnet (810) is symmetrically arranged to establish magneticforce equilibrium with the first magnet (810).

The second magnet (810) may be arranged to establish magnetic forceequilibrium with the first magnet (710). In particular, the first magnet(710) and the second magnet (810) may be disposed such that the magneticforce applied to the first driving part (220) or the second driving part(320) can establish equilibrium.

Meanwhile, the first magnet (710) and the second magnet (810) may bedisposed such that the magnetic force applied to the cover member (100)made of metallic material can establish equilibrium. In addition, thefirst magnet (710) and the second magnet (810) may be disposed such thatthe magnetic force applied to the support member (600) made of metallicmaterial can establish equilibrium.

That is, the first magnet (710) may be disposed at one side of thedriver (200), and the second magnet (810) may be disposed at anotherside of the driver (200). The first magnet (710) and the second magnet(810) may be symmetrically disposed to each other based on a center ofthe bobbin (210). That is, the first magnet (710) and the second magnet(810) may be symmetrically disposed to each other based on an opticalaxis of the lens module. In other words, the first magnet (710) and thesecond magnet (810) may be symmetrically disposed to each other based onan optical axis of the lens driving device (10).

The first magnet (710) and the second magnet (810) may be in shape andsize corresponding to those of each other. The second magnet (810) maybe disposed at the second mounting part (820). The second magnet (810)may be disposed at the second mounting part (820) disposed on an outercircumferential surface of the bobbin (210).

The second mounting part (820) may be disposed on an outercircumferential surface of the bobbin (210). The second mounting part(820) may be disposed symmetrically to the first mounting part (720)based on an optical axis of the lens module.

That is, in the case that the bobbin (210) has four lateral surfaces,the first mounting part (720) and the second mounting part (820) may berespectively disposed at the lateral surfaces facing each other. Thatis, the first mounting part (720) may be disposed at one surface of thebobbin (210), and the second mounting part (820) may be disposed atanother surface of the bobbin (210).

The first mounting part (720) and the second mounting part (820) may bedisposed to be overlapped in a horizontal direction. The second mountingpart (820) may be formed by being recessed more than the driving partcoupling part (212) formed by being recessed on an outer circumferentialsurface of the bobbin (210). The second mounting part (820) may beprovided in a shape corresponding to that of the second magnet (810). Anadhesive may be coated between the second mounting part (820) and thesecond magnet (810), such that the second magnet (810) can fixed to thesecond mounting part (820).

According to an exemplary embodiment of the present disclosure, thesecond magnet (810) may be provided as a plurality of second magnets(810). In this case, the plurality of second magnets (810) may bearranged such that the plurality of second magnets (810) can establishmagnetic force equilibrium with the first magnet (710).

The first magnet (710) and the second magnet (810) may be disposed toestablish magnetic force equilibrium with each other.

The bobbin (210) may include a first outer circumferential surface(201), a second outer circumferential surface (202), and a first edgepart (203) formed by encounter of the first outer circumferentialsurface (201) and the second outer circumferential surface (202). Inthis case, the first magnet (710) may be disposed at the first outercircumferential surface (201). Meanwhile the first magnet (710) may bedisposed biased to the first edge part (203). That is, the first magnet(710) may be disposed aside from a center of the first outercircumferential surface (201). In other words, a center of the firstmagnet (710) may not be identical to a center of the first outercircumferential surface (201).

The bobbin (210) may include a third outer circumferential surface (204)facing the first outer circumferential surface (201), a fourth outercircumferential surface (202) facing the second outer circumferentialsurface (202), and a second edge part (206) formed by encounter of thethird outer circumferential surface (204) and the fourth outercircumferential surface (205). In this case, the second magnet (810) maybe disposed at the third outer circumferential surface (204). Meanwhilethe second magnet (810) may be disposed biased to the second edge part(206). That is, the second magnet (810) may be disposed aside from acenter of the third outer circumferential surface (204). In other words,a center of the second magnet (810) may not be identical to a center ofthe third outer circumferential surface (204).

Meanwhile, the fourth driving magnet (324) illustrated in FIG. 5 may bealso referred to as “third magnet”, in order to be distinctive from“first magnet (710)” and “second magnet (810)”.

Hereinafter, operations of a camera module according to an exemplaryembodiment of the present disclosure will be described with reference todrawings.

FIG. 6 is a graph illustrating an effect of a lens driving deviceaccording to an exemplary embodiment of the present disclosure.

At first, an electric power may be applied to the first driving part(220) provided as a coil. Here, a supply route of the electric power maybe various. According to an exemplary embodiment of the presentdisclosure, the electric power supplied from an external source throughthe terminal part (751) of the circuit board (750) may be supplied tothe coil through a pair of the lower support members (620). Here, thefirst driving part (220) and the bobbin (210) that moves integrally withthe first driving part (220) may move upward or downward, depending on adirectional nature of the current supplied to the coil. Through suchoperation as described in the above, the lens driving device (10) mayperform AF (Auto Focus) function. Meanwhile, the tilt of the bobbin(210) may also be controlled by the electric power applied to the coil,such that an OIS (Optical Image Stabilization) can be performed.

A feedback control may be performed in order for more precise AFfunction. In particular, when the bobbin (210) is moved by the currentapplied to the coil, the sensor part (730) may sense movement of thefirst magnet (710) in real time, and may transmit the sensed informationto the controller. Afterwards, the controller may perform feedbackcontrol, by determining, based on the information received from thesensor part (730), whether or not to additionally move the bobbin (210).

Meanwhile, in the process of feedback control as described in the above,the first magnet (710), which is a subject to be sensed by the sensorpart (730), may exert magnetic influence on the first driving part(220), the second driving part (320), the support member (600), and thecover member (100).

This phenomenon may be ascertained in FIG. 6(a). FIG. 6(a) illustrates aresult of experiment with respect to response characteristic of thecamera module including only a first magnet (710) without a secondmagnet (810). In FIG. 6(a), a displacement amount of the bobbin (210) isillustrated as “a”, and a tilt amount of the bobbin (210) is illustratedas “b”, where the amount of current applied to the coil is defined as anx-axis, and the displacement is defined as a y-axis.

Referring to FIG. 6(a), it can be ascertained that the displacementamount of the bobbin (210) increases as the amount of current applied tothe coil increases (c). Thereafter, when the amount of current reaches apredetermined value, the displacement amount of the bobbin (210) doesnot increase, even though the amount of current applied to the coilfurther increases. This is because the bobbin (210) has been stablyaccommodated on the base (500) while moving downward (d).

However, it is illustrated in FIG. 6(a) that the bobbin (210) has a tiltof around 210 μm while being stably accommodated on the base (500). Thatis, there is a tilt of around 210 μm when the bobbin (210) is stablyaccommodated on the base (500), in comparison with an initial status ofthe bobbin (210). It may be interpreted that a static tilt to an extentof around 210 μm is generated on the bobbin (210) in its initial statuswhere no current is applied to the coil, when deeming that the statuswhere the bobbin (210) is stably accommodated on the base (500) is astatus where the tilt is 0 μm. That is, the first magnet (710) hasgenerated a static tilt to the extent of around 210 μm in the initialstatus where no current is applied to the coil.

FIG. 6(b) illustrates a result of experiment with respect to responsecharacteristic of the camera module including both the first magnet(710) and the second magnet (810) arranged to establish magnetic forceequilibrium with the first magnet (710). In FIG. 6(b), a displacementamount of the bobbin (210) is illustrated as “e”, and a tilt amount ofthe bobbin (210) is illustrated as “f”, where the amount of currentapplied to the coil is defined as an x-axis, and the displacement isdefined as a y-axis.

Referring to FIG. 6(b), it can be ascertained that the displacementamount of the bobbin (210) increases as the amount of current applied tothe coil increases (g). Thereafter, when the amount of current reaches apredetermined value, the displacement amount of the bobbin (210) doesnot increase, even though the amount of current applied to the coilfurther increases. This is because the bobbin (210) has been stablyaccommodated on the base (500) while moving downward (h). So far, it isthe same as FIG. 6(a).

However, it is illustrated in FIG. 6(b) that the bobbin (210) has a tiltof around 60 μm while being stably accommodated on the base (500). Thatis, it may be interpreted that a static tilt to an extent of around 60μm is generated on the bobbin (210) in the initial status where nocurrent is applied to the coil.

Therefore, when comparing FIG. 6(a) with FIG. 6(b), it can beascertained that the static tilt of around 210 μm in FIG. 6(a) has beenreduced to around 60 μm by the second magnet (810) at a difference ofaround 150 μm in FIG. 6(b). That is, the camera module according to anexemplary embodiment of the present disclosure can provide more preciseauto focus function, by reducing the static tilt amount and the dynamictilt amount of the bobbin as well, using the second magnet.

Hereinafter, a structure of the lens driving device (1010) will bedescribed in detail with reference to the drawings.

FIG. 7 is a perspective view illustrating a lens driving deviceaccording to an exemplary embodiment of the present disclosure; FIG. 8is an exploded perspective view illustrating a lens driving deviceaccording to an exemplary embodiment of the present disclosure; FIG. 9is a plan view illustrating some parts of a lens driving deviceaccording to an exemplary embodiment of the present disclosure; FIG. 10is a plan view illustrating a lens driving device of FIG. 9 with ahousing being omitted; FIG. 11 is a sectional view in a direction ofL1-L2 line of FIG. 7; and FIG. 12 is a conceptual view illustrating alens driving device according to an exemplary embodiment and a modifiedexemplary embodiment of the present disclosure.

Referring FIGS. 7 through 12, the lens driving device (1010) accordingto an exemplary embodiment of the present disclosure may include a covermember (1100), a first driver (1200), a second driver (1300), a stator(1400), a base (1500), a support member (1600), and a first sensor part(1700). Alternatively, at least one of the cover member (1100), thefirst driver (1200), the second driver (1300), the stator (1400), thebase (1500), the support member (1600), and the first sensor part (1700)may be omitted in the lens driving device (1010) according to anexemplary embodiment of the present disclosure.

The cover member (1100) may form an external appearance of the lensdriving device (1010). For example, the cover member (1100) may beformed in a shape of a hexahedron of which lower portion is opened, butnot limited hereto. The cover member (1100) may include an upper surface(1101) and a lateral surface (1102) extended downward form an outer sideof the upper surface (1101). Meanwhile, the cover member (1100) may beinstalled at an upper portion of the base (1500). The first driver(1200), the second driver (1300), the stator (1400), and the supportmember (1600) may be disposed at an internal space formed by the covermember (1100) and the base (1500). In addition, the cover member (1100)may be coupled to the base (1500) with an inner lateral surface of thecover member (1100) closely adhered to a part or a whole of a lateralsurface of the base (1500). Through this structure, the cover member(1100) may protect internal components from external impacts and inhibitpenetration of external pollutants as well.

The cover member (1100) may be formed of metallic material. Inparticular, the cover member (1100) may be provided as a metallic plate.In this case, the cover member (1100) may block electronic interference.That is, the cover member (1100) may block electromagnetic wavegenerated outside of the lens driving device (110) from being introducedin the cover member (1100). In addition, the cover member (1100) mayblock electromagnetic wave generated inside of the lens driving device(1010) from being released out of the cove member (100). However, thematerial forming the cover member (100) is not limited hereto.

The cover member (1100) may include an opening (1110) formed on an uppersurface and exposing the lens module. The opening (1110) may be formedin a shape corresponding to that of the lens module. That is, the lightincident through the opening (1110) may pass through the lens module.Meanwhile, the light that has passed through the lens module may bedelivered to the image sensor.

The first driver (1200) may include a bobbin (1210) and a first drivingpart (1220). The first driver (1200) may be coupled to a lens modulethat is a component of a camera module (here, the lens module may alsobe described as a component of the lens driving device (1010)). That is,the lens module may be disposed at an inner side of the first driver(1200). In other words, an inner circumferential surface of the firstdriver (1200) may be couple to an outer circumferential surface of thelens module. Meanwhile, the first driver (1200) may dynamically moveintegrally with the lens module through an interaction with the seconddriver (1300). That is, the first driver (1200) may move the lensmodule.

The first driver (1200) may include a bobbin (1210). In addition, thefirst driver (1200) may include a first driving part (1220) coupled tothe bobbin (1210).

The bobbin (1210) may be coupled to the lens module. In particular, anouter circumferential surface of the lens module may be coupled to aninner circumferential surface of the bobbin (1210). Meanwhile, the firstdriving part (1220) may be coupled to the bobbin (1210). In addition, alower portion of the bobbin (1210) may be coupled to a lower supportmember (1620), and an upper portion of the bobbin (1210) may be coupledto an upper support member (1610). The bobbin (1210) may be disposed atan inner side of the housing (1310). The bobbin (1210) may dynamicallymove relative to the housing (1310) in an optical axis direction.

The bobbin (1210) may include a lens coupling part (1211) formed at aninner side of the bobbin (1210). The lens module may be coupled to thelens coupling part (1211). A screw thread may be formed on an innercircumferential surface of the lens coupling part (1211), in a shapecorresponding to that of a screw thread formed on an outercircumferential surface of the lens module. That is, the outercircumferential surface of the lens module may be coupled to the innercircumferential surface of the lens coupling part (1211).

The bobbin (1210) may include a first driving part coupling part (1212)guiding the first driving part (1220) to be wound or installed. Thefirst driving part coupling part (1212) may be integrally formed with anouter lateral surface of the bobbin (1210). In addition, the firstdriving part coupling part (1212) may be formed consecutively along anouter circumferential surface of the bobbin (1210). Alternatively, thefirst driving part coupling part (1212) may be formed by being spaced ata predetermined interval along an outer circumferential surface of thebobbin (1210).

The first driving part coupling part (1212) may include a recessed partformed by a part of an outer lateral surface of the bobbin (1210) beingrecessed. Meanwhile, the first driving part (1220) disposed at the firstdriving part coupling part (1212). The first driving part (1220)disposed at the first driving part coupling part (1212) may be supportedby a support part forming a part of the first driving part coupling part(1212).

The bobbin (1210) may include an upper coupling part (1213) coupled toan upper support member (1610). The upper coupling part (1213) may becoupled to an inner part (1612) of the upper support member (1610). Asan example, the upper coupling part (1213) provided as a protrusion maybe coupled by being inserted in the inner part (1612) provided as agroove. Meanwhile, a protrusion may be provided at the upper supportmember (1610) and a groove may be formed at the bobbin (1210), and thesetwo components may be couple to each other.

Meanwhile, the bobbin (1210) may include a lower coupling part (notillustrated) coupled to a lower support member (1620). The lowercoupling part formed at a lower portion of the bobbin (1210) may becoupled to an inner part (1622) of the lower support member (1620). Asan example, the lower coupling part provided as a protrusion may becoupled by being inserted in the inner part (1622) provided as a groove.

The first driving part (1220) may be disposed facing the second drivingpart (1320) of the second driver (1300). The first driving part (1220)may move the bobbin (1210) with respect to the housing (1310), throughelectromagnetic interaction with the second driving part (1320). Thefirst driving part (1220) may include a coil. The coil may be wound onan outer surface of the bobbin (1210), by being guided by the firstdriving part coupling part (1212).

In addition, the coil may include four independent coils, of which twoadjacent coils may form a 90 degree angle to be arranged at an outersurface of the bobbin (1210). In a case where the first driving part(1220) includes a coil, the electric power supplied to the coil may besupplied through the lower support member (1620). Here, the lowersupport member (1620) may be separately provided in a pair. Meanwhile,the first driving part (1220) may include a pair of lead cables (notillustrated) for electric power supply. In this case, each of the pairof lead cables of the first driving part (1220) may be respectivelycoupled to the pair of the lower support members (1620). Meanwhile, anelectromagnetic field may be formed around the coil, when the electricpower is supplied to the coil. In addition, the first driving part(1220) may include a magnet. In such case, the second driving part(1320) may be provided as a coil.

The second driver (1300) may be disposed at an outer side of the firstdriver (1200) by facing the first driver (1200). The second driver(1300) may be supported by the base (1500) disposed at a lower side. Thesecond driver (1300) may be disposed at an internal space of the covermember (1100).

The second driver (1300) may include a housing (1310) disposed at anouter side of the bobbin (1210). In addition, the second driver (1300)may include a second driving part (1320) that is disposed facing thefirst driving part (1220) and fixed to the housing (1310).

The housing (1310) may be formed in shape corresponding to an innerlateral surface of the cover member (1100) forming an externalappearance of the lens driving device (1010). In addition, the housing(1310) may be formed of an insulated material, and may be implemented asan injection molding material, in consideration of productivity. Thehousing (1310) may be arranged to be spaced apart at a predetermineddistance from the cover member (1100), as a movable component for OIS(Optical Image Stabilization) operation.

Alternatively, in the AF (Auto Focus) model, the housing (1310) may befixed on the base (1500). In addition, in the AF model, the housing(1310) may be omitted, and a magnet operating as the second driving part(1320) may be fixed to the cover member (1100).

In addition, upper and lower sides of the housing (1310) may be openedto accommodate the driver (1200) movable in up/downward directions. Thehousing (1310) may internally include an inner space (1311), where upperand lower sides of the inner space (1311) are opened. The first driver(1200) may be movably disposed at the inner space (1311). That is, theinner space (1311) may be provided in a shape corresponding to a shapeof the first driver (1200). In addition, an outer circumferentialsurface of the inner space (1311) may be disposed spacing apart from anouter circumferential surface of the first driver (1200).

The housing (1310) may include a second driving part coupling part(1312) at a lateral surface of the housing (1310), where the seconddriving part coupling part (1312) may be formed in a shape correspondingto a shape of the second driving part (1320) to accommodate the seconddriving part (1320). That is, the second driving part coupling part(1312) may accommodate the second driving part (1320) and fix the seconddriving part (1320). The second driving part (1320) may be fixed to thesecond driving part coupling part (1312) using an adhesive (notillustrated). Meanwhile, the second driving part coupling part (1312)may be disposed on an inner circumferential surface of the housing(1310).

In this case, there is an advantage in that an electromagneticinteraction with the first driving part (1220) disposed at an inner sideof the second driving part (1320) can be facilitated. According to anexemplary embodiment of the present disclosure, a lower portion of thesecond driving part coupling part (1312) may be opened. In this case,there is an advantage in that an electromagnetic interaction between thesecond driving part (1320) and the third driving part (1340) disposed ata lower side of the second driving part (1320) can be facilitated.According to an exemplary embodiment of the present disclosure, thesecond driving part coupling part (1312) may be provided in four pieces.The second driving part (1320) may be respectively couple to the four ofthe second driving part coupling parts (1312).

The upper support member (1610) may be coupled to an upper portion ofthe housing (1310), and the lower support member (1900) may be coupledto a lower portion of the housing (1310). The housing (1310) may includean upper coupling part (1313) coupled to the upper support member(1610).

The upper coupling part (1313) may be coupled to an outer part (1611) ofthe upper support member (1610). According to an exemplary embodiment ofthe present disclosure, the upper coupling part (1313) provided as aprotrusion may be coupled by being inserted in a groove or a hole of theouter part (1611). Alternatively, a protrusion may be provided on theupper support member (1610), and a groove may be provided on the housing(1310), such that these two components can be coupled to each other.

Meanwhile, the housing (1310) may include a lower coupling part (notillustrated) coupled to the lower support member (1620). The lowercoupling part formed at a lower portion of the housing (1310) may becoupled to an outer part (1621) of the lower support member (1620).According to an exemplary embodiment of the present disclosure, thelower coupling part provided as a protrusion may be coupled by beinginserted in a groove or a hole of the outer part (1621).

The second driving part (1320) may be disposed facing to the firstdriving part (1220) of the first driver (1200). The second driving part(1320) may move the first driving part (1220) through electromagneticinteraction with the first driving part (1220). The second driving part(1320) may include a magnet. The magnet may be fixed at the seconddriving part coupling part (1312) of the housing (1310).

According to an exemplary embodiment of the present disclosure, asillustrated in FIG. 8, four independent magnets may be independentlyprovided and arranged at the housing (1310), where two adjacent magnetsmay form a 90 degree angle with each other. That is, the second drivingpart (1320) may be arranged at four edges inside of the housing (1310)at a same interval, aiming to efficient use of internal volume. Inaddition, the second driving part (1320) may adhere to the housing(1310) using such as an adhesive, but not limited hereto. Meanwhile, thefirst driving part (1220) may include a magnet, and the second drivingpart (1320) may be provided as a coil.

The stator (1400) may be disposed facing to a lower side of the seconddriver (1300). Meanwhile, the stator (1400) may move the second driver(1300). In addition, penetrating holes (1411, 1421) corresponding to thelens module may be disposed at a center of the stator (1400).

The stator (1400) may include a circuit board (1410) disposed betweenthe third driving part (1420) and the base (1500). In addition, thestator (1400) may include a third driving part (1420) disposed facing toa lower side of the second driving part (1320).

The circuit board (1410) may include an FPCB (Flexible Printed CircuitBoard). The circuit board (1410) may be disposed between the thirddriving part (1420) and the base (1500). Meanwhile, the circuit board(1410) may supply electric power to the third driving part (1420).

In addition, the circuit board (1410) may supply electric power to thefirst driving part (1220) through a lateral support member (1630), anupper support member (1610), a conducting member (1640), and a lowersupport member (1620). The circuit board (1410) may include apenetrating hole (1411), where the light that has passed through thelens module may pass through the penetrating hole (1411). In addition,the circuit board (1410) may include a terminal part (1412) that is bentto be exposed to the outside. The terminal part (1412) may be connectedto an external electric power source, such that the circuit board (1410)can be supplied with electric power.

The third driving part (1420) may include a coil. The housing (1310)fixed with the second driving part (1320) may be integrally moved byinteraction with the second driving part (1320), when electric power isapplied to a coil of the third driving part (1420). The third drivingpart (1420) may be electrically connected or installed on the circuitboard (1410).

Meanwhile, the third driving part (1420) may include a penetrating hole(1421) for penetrating the light of the lens module. In addition, thethird driving part (1420) may be formed as an FP (Fine Pattern) coil tobe arranged or installed on the circuit board (1410), in considerationof miniaturization (lowering the height in z-axis direction that is anoptical axis direction) of the lens driving device (1010).

The base (1500) may support the second driver (1300). A PCB (PrintedCircuit Board) may be disposed at a lower side of the base (1500). Thebase (1500) may include a penetrating hole (1510) formed at a positioncorresponding to that of the lens coupling portion of the bobbin (1210).The base (1500) may function as a sensor holder protecting the imagesensor. Meanwhile, an infrared ray filter may be disposed at the base(1500). The infrared ray filter may be coupled to the penetrating hole(1510) of the base (1500).

According to an exemplary embodiment of the present disclosure, the base(1500) may include a foreign material collecting part (1520) forcollecting foreign materials introduced in the cover member (1100). Theforeign material collecting part (1520) may be disposed on an uppersurface of the base (1500) and may include an adhesive material, suchthat foreign material collecting part (1520) can collect foreignmaterials in the inner space, where the foreign materials may begenerated by the cover member (1100) and the base (1500).

The base (1500) may further include a sensor installation part (1530) towhich the first sensor part (1700) is coupled. That is, the first sensorpart (1700) may be installed at the sensor installation part (1530).Here, the first sensor part (1700) may sense movement of the housing(1310) in horizontal directions by detecting the second driving part(1320) coupled to the housing (1310). According to an exemplaryembodiment of the present disclosure, two of the sensor installationpart (1530) may be provided. The first sensor part (1700) may bedisposed at each of the two sensor installation parts (1530). In thiscase, the first sensor part (1700) may be so arranged as to sensemovement of the housing (1310) in both of x-axis and y-axis directions.

The support member (1600) may connect at least any two of the firstdriver (1200), the second driver (1300), and the base (1500). Thesupport member (1600) may elastically connect at least any two of thefirst driver (1200), the second driver (1300), and the base (1500), suchthat a relative movement between each component may be available. Thatis, the support member (1600) may be provided as an elastic member.

According to an exemplary embodiment of the present disclosure, asillustrated in FIG. 8, the support member (1600) may include an uppersupport member (1610), a lower support member (1620), a lateral supportmember (1630), and a conducting member (1640). Here, the conducingmember (1640) may be provided only for electrical conduction between theupper support member (1610) and the lower support member (1620). Thus,the conducting member (1640) may be described in distinction from theupper support member (1610), the lower support member (1620), thelateral support member (1630), and the conducting member (1640).

According to an exemplary embodiment of the present disclosure, theupper support member (1610) may include an outer part (1611), an innerpart (1612), and a connecting part (1613). The upper support member(1610) may include an outer part (1611) coupled to the housing (1310),an inner part (1612) coupled to the bobbin (1210), and a connecting part(1613) elastically connecting the inner part (1612) and the outer part(1611).

The upper support member (1610) may be connected to an upper portion ofthe first driver (1200) and to an upper portion of the second driver(1300). In particular, the upper support member (1610) may be coupled toan upper portion of the bobbin (1210) and to an upper portion of thehousing (1310). The inner part (1612) of the upper support portion(1610) may be coupled to an upper coupling part (1213) of the bobbin(1210), and the outer part (1614) of the upper support member (1610) maybe coupled to an upper coupling part (1313) of the housing (1310).

According to an exemplary embodiment of the present disclosure, theupper support member (1610) may be divided in six pieces. Two of thetotally six divided pieces of the upper support member (1610) may beused to apply electric power to the first driving part (1220). Each ofthe two upper support members (1610) may be respectively connected to apair of lower support members (1620 a, 1620 b) through the conductingmember (1640). Meanwhile, the rest four pieces among the six uppersupport members (1610) may be used to apply electric power to the secondsensor part (1900) and to input/output information between thecontroller and the second sensor part (1900). In addition, as a modifiedexemplary embodiment, two pieces of the six upper support members (1610)may be directly connected to the first driving part (1220), and the restfour pieces may be connected to the second sensor part (1900).

According to an exemplary embodiment of the present disclosure, thelower support member (1620) may include a pair of lower support members(1620 a, 1620 b). That is, the lower support member (1620) may include afirst lower support member (1620 a) and a second lower support member(1620 b). Each of the first lower support member (1620 a) and the secondlower support member (1620 b) may be connected to each of a pair of leadwires of the first driving part (1220) so as to supply electric power.Meanwhile, a pair of the lower support member (1620) may be electricallyconnected to the circuit board. Through this structure, the pair of thelower support member (1620) may supply electric power supplied from thecircuit board to the first driving part (1220).

According to an exemplary embodiment of the present disclosure, thelower support member (1620) may include an outer part (1621), an innerpart (1622), and a connecting part (1623). The lower support member(1620) may include an outer part (1621) coupled to the housing (1310),an inner part (1622) coupled to the bobbin (1210), and a connecting part(1623) elastically connecting the outer part (1621) and the inner part(1622).

The lower support member (1620) may be connected to a lower portion ofthe first driver (1200) and to a lower portion of the second driver(1300). In particular, the lower support member (1620) may be coupled toa lower portion of the bobbin (1210) and to a lower portion of thehousing (1310). The inner part (1622) of the lower support member (1620)may be coupled with a lower coupling part of the bobbin (1210), and theouter part (1621) of the lower support member (1620) may be coupled witha lower coupling part of the housing (1310).

An end of the lateral support member (1630) may be fixed to the stator(1400) or to the base (1500), and another end of the lateral supportmember (1630) may be coupled to the upper support member (1610) or tothe second driver (1300). According to an exemplary embodiment of thepresent disclosure, an end of the lateral support member (1630) may becouple to the base (1500), and another end of the lateral support member(1630) may be coupled to the second driver (1300). Alternatively, an endof the lateral support member (1630) may be couple to the stator (1400),and another end of the lateral support member (1630) may be coupled tothe upper support member (1610). In this wise, the lateral supportmember (1630) may elastically support the second driver (1300), suchthat the second driver (1300) can be tilted or moved in horizontaldirections.

According to an exemplary embodiment of the present disclosure, thelateral support member (1630) may be provided in the same number as thenumber in which the upper support member (1610) is provided. That is,six of the lateral support members (1630) may be provided andrespectively connected to six of the upper support member (1610). Inthis case, the lateral support member (1630) may supply electric powersupplied from the stator (1400) or from any external source to each ofthe upper support members (1610). According to an exemplary embodimentof the present disclosure, the number of the lateral support member(1630) may be determined in consideration of symmetry. According to anexemplary embodiment of the present disclosure, as illustrated in FIG.8, totally eight of the lateral support member (1630) may be provided,two pieces at each of edges of the housing (1310).

According to an exemplary embodiment of the present disclosure, thelateral support member (1630) may be coupled to the upper support member(1610) and may include a structure for absorbing impacts. The structurefor absorbing impacts may be provided at at least one of the lateralsupport member (1630) and the upper support member (1610). The structurefor absorbing impacts may be a separate member such as a damper.Alternatively, the structure for absorbing impacts may be implementedthrough shape modification in some part of at least one of the lateralsupport member (1630) and the upper support member (1610).

The conducting member (1640) may electrically connect the upper supportmember (1610) and the lower support member (1620). The conducting member(1640) may be provided in separation from the lateral support member(1630). The electric power supplied to the upper support member (1610)may be supplied to the lower support member (1900) through theconducting member (1640). The electric power may be supplied to thefirst driving part (1220) through the lower support member (1620).Meanwhile, in a modified exemplary embodiment, the conducting member(1640) may be omitted, when the upper support member (1610) is directlyconnected to the first driving part (1220).

The first sensor part (1700) may be used for at least one of AF (AutoFocus) feedback and OIS (Optical Image Stabilization) feedback. That is,the first sensor part (1700) may detect a position or movement of atleast one of the first driver (1200) and the second driver (1300).According to an exemplary embodiment of the present disclosure, thefirst sensor part (1700) may provide information for OIS feedback, bysensing a horizontal movement or tilt of the second driver (1300).

The first sensor part (1700) may be disposed at the stator (1400). Thefirst sensor part (1700) may be disposed on an upper surface or a lowersurface of the circuit board (1410) of the stator (1400). According toan exemplary embodiment of the present disclosure, the first sensor part(1700) may be disposed at a sensor installation part (1530) formed onthe base (1500), by being arranged on the lower surface of the circuitboard (1410). According to an exemplary embodiment of the presentdisclosure, the first sensor part (1700) may include a Hall sensor. Inthis case, the first sensor part (1700) may sense a relative movement ofthe second driver (1300) with respect to the stator (1400), by sensingelectromagnetic field of the second driving part (1320) of the seconddriver (1300). According to an exemplary embodiment of the presentdisclosure, at least two of the first sensor parts (1700) may beprovided, such that movement of the second driver (1300) in both x-axisand y-axis directions can be sensed.

According to an exemplary embodiment of the present disclosure, the lensdriving device (1010) may comprise: a first driver (1200) including afirst driving part (1220) and a bobbin (1210) disposed with the firstdriving part (1220); a second driver (1300) including a second drivingpart (1320) configured to move the first driving part (1220) throughelectromagnetic interaction with the first driving part (1220), and ahousing (1310) disposed with the second driving part (1320); a stator(1400) including a third driving part (1420) configured to move thesecond driving part through electromagnetic interaction with the seconddriving part; a first magnet (1810) disposed at one side of the bobbin(1210); a second sensor part (1900) disposed at the housing, and sensinga position of the first magnet; and a second magnet (1820) disposed atanother side of the bobbin (1210).

The bobbin (1210) may include a first outer circumferential surface(1215), a second outer circumferential surface (1216), and a third outercircumferential surfaces (1215), which are consecutively arranged.Meanwhile, the housing (1310) may include a first lateral surface (1315)facing the first outer circumferential surface (1215), a second lateralsurface (1316) facing the second outer circumferential surface (1216),and a corner part (1319) facing the third outer circumferential surfaces(1215).

The housing (1310) may include a first lateral surface (1315), a secondlateral surface (1316) adjacent to the first lateral surface (1315), anda corner part (1319) formed by encounter of the first lateral surface(1315) and the second lateral surface (1316).

Meanwhile, the bobbin (1210) may include a first outer circumferentialsurface (1215) facing the first lateral surface (1315), a second outercircumferential surface (1216) facing the second lateral surface (1316),and a third outer circumferential surface (1217) facing the corner part(1319). Here, the first magnet (1810) may be disposed at the third outercircumferential surface (1217) of the bobbin (1210).

In addition, the second driving part (1320) provided as a magnet may bedisposed at the first lateral surface (1315) and the second lateralsurface (1316) of the housing (1310). The housing (1310) may include afirst lateral surface (1315), a second lateral surface (1316), a thirdlateral surface (1317), a fourth lateral surface (1318), which areconsecutively adjacent to one another.

The second driving part (1320) may include a first driving magnet(1321), a second driving magnet (1322), a third driving magnet (1323),and a fourth driving magnet (1324). Here, the first driving magnet(1321) may be disposed at the first lateral surface (1315), the seconddriving magnet (1322) may be disposed at the second lateral surface(1316), the third driving magnet (1323) may be disposed at the thirdlateral surface (1317), and the fourth driving magnet (1324) may bedisposed at the fourth lateral surface (1318).

Here, a separating space (C1) between the third driving magnet (1323)and the fourth driving magnet (1324) may correspond to a separatingspace (A1) between the first driving magnet (1321) and the seconddriving magnet (1322). Meanwhile, a separating space (D1) between thefirst driving magnet (1321) and the fourth driving magnet (1324) maycorrespond to a separating space (B1) between the second driving magnet(1321) and the third driving magnet (1323).

The second driving part (1320) may include first to fourth drivingmagnets (1321, 1322, 1323, 1324). The first driving magnet (1321) andthe third driving magnet (1323) may be disposed opposite to each other,and the second driving magnet (1322) and the fourth driving magnet(1324) may be disposed opposite to each other. In addition, it may bealso described that the first driving magnet (1321) may face the thirddriving magnet (1323) and the second driving magnet (1322) may face thefourth driving magnet (1324). The first driving magnet (1321) and thethird driving magnet (1323) facing each other may be in a same shape. Inthe same manner, the second driving magnet (1322) and the fourth drivingmagnet (1324) facing each other may be in a same shape. Meanwhile, allof the first to fourth driving magnets (1321, 1322, 1323, 1324) may beprovided in the same shape.

The first magnet (1810) may be disposed to avoid facing the seconddriving part (1320) provided as a magnet. That is, an orthographicprojection of the first magnet (1810) toward the housing may not beoverlapped with the second driving part (1320). In other words, thefirst magnet (1810) may be arranged so as to minimize magnetic forceapplied to the second driving part (1320). As illustrated in FIG. 12(a),the first magnet (1810) may be disposed at the third circumferentialsurface (1217) of the bobbin (1210). That is, the first magnet (1810)may be disposed on the bobbin (1210), so as to face the corner part(1319) of the housing (1310).

The first magnet (1810) may be spaced apart from the first driving part(1220) in a direction corresponding to an optical axis direction of alens module coupled at an inner side of the bobbin (1210). Meanwhile,the first magnet (1810) may be spaced apart also from the second drivingpart (1220) in a direction corresponding to the optical axis directionof a lens module.

The first magnet (1810) may be disposed at an accommodating groove(1214) formed on the bobbin (1210). The accommodating groove (1214) maybe of a bottom-opening type or a top-opening type. Here, the firstmagnet (1810) may have an N-pole and an S-pole disposed at an uppersurface and a lower surface of the first magnet (1810), respectively. Inthis case, the first magnet (1810) may be coupled to the accommodatinggroove (1214), by a method of pushing one first magnet (1810) among aplurality of first magnets (1810) having N-poles and S-poles alternatelyarranged into an opening at an upper portion or a lower portion of theaccommodating groove (1214). Thereby, the process to respectively couplethe first magnet (1810) to each of the plurality of bobbins (1210) canbe enhanced in convenience.

The accommodating groove (1214) may be of a top-and-bottom closing typeformed by a part of the outer circumferential surface internallyrecessed. The first magnet (1810) may have an N-pole and an S-poledisposed at lateral surfaces of the first magnet (1810). In this case,the first magnet (1810) may be coupled to the accommodating groove(1214), by a method of pushing one first magnet (1810) among a pluralityof first magnets (1810) having N-poles and S-poles alternately arrangedin from a lateral side. Thereby, the process to respectively couple thefirst magnet (1810) to each of the plurality of bobbins (1210) can beenhanced in convenience.

The second magnet (1820) may also be referred to as symmetrical magnetor a compensating magnet, because the second magnet (1810) issymmetrically arranged to establish magnetic force equilibrium or weightequilibrium with the first magnet (1810). The second magnet (1820) maybe provided for the magnetic force equilibrium or weight equilibriumwith the first magnet (1810). The first magnet (1810) and the secondmagnet (1820) may be disposed such that the magnetic force applied tothe first driving part (1220) or the second driving part (1320) canestablish equilibrium. That is, the second magnet (1820) may be providedin order to inhibit the first magnet (1810) from affectingelectromagnetic interaction between the first to third driving parts(1220, 1320, 1420). Alternatively, the second magnet (1820) may beprovided for compensating the effect to secure performance of AF and/orOIS function, even if the first magnet (1810) affects electromagneticinteraction between the first to third driving parts (1220, 1320, 1420).

The first magnet (1810) and the second magnet (1820) may be disposedoverlapped with the second driving part (1220) in a horizontaldirection. Alternatively, the first magnet (1810) and the second magnet(1820) may be disposed to avoid being overlapped with the second drivingpart (1220) in a horizontal direction.

The first magnet (1810) may be disposed overlapped with the sensor(1910) in a horizontal direction. Alternatively, the first magnet (1810)may be disposed to avoid being overlapped with the sensor (1910) in ahorizontal direction.

The first magnet (1810) and the second magnet (1820) may be disposedoverlapped with the upper support member (1610) and/or the lower supportmember (1620) in a vertical direction. In particular, the first magnet(1810) and the second magnet (1820) may be disposed overlapped with aconnecting part (1613) of the upper support member (1610) and/or aconnecting part (1623) of the lower support member (1620) in a verticaldirection

The first magnet (1810) and the second magnet (1820) may be disposed,such that magnetic force applied to the cover member (1100) made of ametallic material can establish equilibrium. In addition, the firstmagnet (1810) and the second magnet (1820) may be disposed, such thatmagnetic force applied to the support member (1600) made of a metallicmaterial can establish equilibrium. That is, the first magnet (1810) maybe disposed at one side of the first driver (1200), and the secondmagnet (1820) may be disposed at another side of the first driver(1200).

The first magnet (1810) and the second magnet (1820) may besymmetrically disposed to each other, based on a center of the bobbin(1210). That is, the first magnet (1810) and the second magnet (1820)may be symmetrically disposed to each other, based on an optical axis ofthe lens module. In other words, the first magnet (1810) and the secondmagnet (1820) may be symmetrically disposed to each other, based on anoptical axis of the lens driving device (1010).

The first magnet (1810) and the second magnet (1820) may be in shape andsize corresponding to those of each other. The second magnet (1820) maybe disposed at a second magnet accommodating groove (not illustrated)disposed on an outer circumferential surface of the bobbin (1210).

According to an exemplary embodiment of the present disclosure, thesecond magnet (1820) may be provided in plural number. In this case, theplurality of second magnets (1820) may be arranged such that influenceof magnetic force provided by the plurality of second magnets (1820) andthe first magnet (1810) can establish equilibrium.

The first magnet (1810) and the second magnet (1820) may be spaced apartat a distance corresponding to a center of the bobbin (1210). The centerof the bobbin (1210) may be disposed on a virtual line connecting thefirst magnet (1810) and the second magnet (1820). That is, the firstmagnet (1810) and the second magnet (1820) may be disposed symmetricallybased on a center of the bobbin (1210).

The first magnet (1810) and the second magnet (1820) may be in shape andsize corresponding to those of each other. The first magnet (1810) andthe second magnet (1820) may be disposed to establish magnetic forceequilibrium or weight equilibrium with each other.

The second sensor part (1900) may sense a position of the first magnet(1810). The controller (not illustrated) may control the electric powerapplied to the first driving part (1220) by receiving a position of thefirst magnet (1810) sensed by the second sensor part (1900). That is,the position sensed by the second sensor part (1900) may be used forperforming AF feedback function. The second sensor part (1900) may bedisposed at a corner part (1319) of the housing (1310).

The second sensor part (1900) may include a sensor (1910) and a circuitboard (1920) mounted with the sensor (1910). According to an exemplaryembodiment of the present disclosure, the sensor (1910) may be a Hallsensor configured to sense magnetic force of a magnet. According to anexemplary embodiment of the present disclosure, the circuit board (1920)may be fixed to an outer side of the housing (1310), but not limitedhereto. The circuit board (1920) may be directly connected to thecircuit board (1410) of the stator (1400), or may be connected throughthe lateral support member (1630) and the upper support member (1610).The sensor (1910) may be supplied with electric power through thecircuit board (1920), and may transmit/receive a sensing value and acontrol signal.

Meanwhile, the second sensor part (1900) may be disposed spaced from thesecond driving part (1320) in a direction corresponding to an opticalaxis direction of the lens module. That is, the second sensor part(1900) may be disposed to be overlapped with an orthographic projectionof the first magnet (1810) toward the housing (1310).

Hereinafter, the lens driving device according to a modified exemplaryembodiment of the present disclosure will be described with reference toFIG. 12.

Referring to FIG. 12(a), in the lens driving device according to anexemplary embodiment of the present disclosure, the first magnet (1810)may be disposed facing a separating space between the first drivingmagnet (1321) and the second driving magnet (1322). In particular, thefirst magnet (1810) may be disposed facing the corner part (1319) of thehousing (1310). Here, an encountering angle between a virtual lineconnecting a center of the first driving magnet (1321) to a center (X)of the housing (1310) and a virtual line connecting a center of thesecond driving magnet (1322) to a center (X) of the housing (1310) mayform a right (perpendicular) angle.

Referring to FIG. 12(b), in the lens driving device according to amodified exemplary embodiment of the present disclosure, it is the samethat the first magnet (1810) may be disposed facing the corner part(1319) of the housing (1310), as in the previous exemplary embodiment.However, as illustrated in FIG. 12(b), a first separating distance (A2)between the first driving magnet (1321) and the second driving magnet(1322) may be longer than a second separating distance (B2) between thesecond driving magnet (1322) and the third driving magnet (1323). Thatis, the first separating distance (A2) of the first separating spacefacing the first magnet (1810) may be longer than the second separatingdistance (B2). In this case, influence of magnetic force that the firstmagnet (1810) applies to the second driving part (1320) can beminimized.

Meanwhile, according to a modified exemplary embodiment of the presentdisclosure, an encountering angle between a virtual line connecting acenter of the first driving magnet (1321) to a center of the housing(1310) and a virtual line connecting a center of the second drivingmagnet (1322) to a center of the housing (1310) may form an acute angleor an obtuse angle. As an example, as illustrated in FIG. 12(b), theencountering angle (02) between a virtual line connecting a center ofthe first driving magnet (1321) to a center of the housing (1310) and avirtual line connecting a center of the second driving magnet (1322) toa center of the housing (1310) may form an obtuse angle.

Referring to FIG. 12 (c), in the lens driving device according toanother modified exemplary embodiment of the present disclosure, thefirst magnet (1810) may be disposed at a first outer circumferentialsurface (1215) of the bobbin (1210). Here, the first magnet (1810) maybe disposed biased to the third outer circumferential surface (1217). Inthis case, the orthographic projection of the first magnet (1810) towardthe housing (1310) may not be overlapped with the second driving part(1320). That is, the first magnet (1810) may be disposed spaced apartfrom the second driving part (1320) in upward/downward directions (in anoptical axis direction of the lens module).

Referring to FIG. 12(d), in the lens driving device according to stillanother modified exemplary embodiment of the present disclosure, thefirst magnet (1810) may be disposed at a first outer circumferentialsurface (1215) of the bobbin (1210). Here, the first magnet (1810) maybe disposed biased to the third outer circumferential surface (1217). Inthis case, the orthographic projection of the first magnet (1810) towardthe housing (1310) may not be overlapped with the second driving part(1320). Meanwhile, the second driving part (1320) may include first tofourth driving magnets (1321, 1322, 1323, 1324).

The first driving magnet (1321) and the third driving magnet (1323) maybe disposed opposite to each other, and the second driving magnet (1322)and the fourth driving magnet (1324) may be disposed opposite to eachother. In addition, it may be also described that the first drivingmagnet (1321) may face the third driving magnet (1323) and the seconddriving magnet (1322) may face the fourth driving magnet (1324).

The first driving magnet (1321) and the third driving magnet (1323)facing each other may be in a same shape. In the same manner, the seconddriving magnet (1322) and the fourth driving magnet (1324) facing eachother may be in a same shape.

However, the first driving magnet (1321) may be provided in a shapedifferent form that of the second driving magnet (1322). According to anexemplary embodiment of the present disclosure, as illustrated in FIG.12(d), the first driving magnet (1321) may be smaller than the seconddriving magnet (1322).

In particular, the first driving magnet (1321) may have a thickness anda height same as those of the second driving magnet (1322), and may havea width (W1, W2) different from that of the second driving magnet(1322). According to an exemplary embodiment of the present disclosure,as illustrated in FIG. 12(d), the width (W1) of the first driving magnet(1321) may be longer than the width (W2) of the second driving magnet(1322). That is, the second driving magnet (1322) may take a shape wheresome part of the width of the first driving magnet (1321) is omitted.Here, the first magnet (1810) may be disposed facing the omitted part ofthe second driving magnet (1322). That is, some part of the secondmagnet (1322) may be omitted in order to secure a space in which thefirst magnet (1810) is arranged. In this case, the magnetic force of thefirst magnet (1810) applied to the second driving part (1320) can beminimized.

Meanwhile, as illustrated in FIGS. 12(a) to 12(d), according to someexemplary embodiments and modified exemplary embodiments of the presentdisclosure, the separating distance (C1, C2, C3, C4) between the thirddriving magnet (1323) and the fourth driving magnet (1324) maycorrespond to a separating distance (A1, A2, A3, A4) between the firstdriving magnet (1321) and the second driving magnet (1322). Meanwhile,the separating distance (D1, D2, D3, D4) between the first drivingmagnet (1321) and the fourth driving magnet (1324) may correspond to aseparating distance (B1, B2, B3, B4) between the second driving magnet(1322) and the third driving magnet (1323).

In the above, all elements composing an exemplary embodiment of thepresent disclosure have been described as being integrally combined oroperating in combination, however, the present disclosure is not limitedhereto. That is, within the scope of purpose of the present disclosure,at least one of all such elements may be selectively combined tooperate. In addition, the terms such as “include”, “comprise” or “have”are state that there may be in existence of features, numbers, steps,functions, elements, components described herein, or compositionsthereof. Therefore, they shall not be understood as to exclude thepossibility of existence or addition of one or more other features,numbers, steps, functions, elements, components described herein, orcompositions thereof.

Unless otherwise defined, all terms used herein, including technical orscientific terms, have the same meanings as those generally understoodby those with ordinary knowledge in the field of art to which thepresent disclosure belongs. Such terms as those defined in a generallyused dictionary are to be interpreted to have the meanings equal to thecontextual meanings in the relevant field of art, and are not to beinterpreted to have ideal or excessively formal meanings unless clearlydefined in the present specification.

In the above, exemplary embodiments of the present disclosure have beendescribed. However, these embodiments are merely examples and do notlimit the present invention, so that persons who skilled in the art ofthe present disclosure may easily transform and modify within the limitof the technical spirit of the present disclosure. For example, each ofthe components shown in detail in the embodiments of the presentinvention may be implemented in transformation. In addition, thedifferences relating these transformations and modifications shall beregarded to be included in the scope of the present disclosure asdefined in the attached claims of the present disclosure and theequivalents thereof.

What is claimed is:
 1. A lens driving device, comprising: a housing; abobbin disposed in the housing; a base spaced apart from the housing; afirst coil disposed on the bobbin; a first magnet disposed on thehousing; a circuit board disposed on the base and comprising a secondcoil facing the first magnet; an upper elastic member connecting thebobbin and the housing; and a wire connecting the circuit board and theupper elastic member, wherein the housing comprises a first corner and asecond corner opposite to each other, and a third corner and a fourthcorner opposite to each other, wherein the first magnet comprises afirst driving magnet disposed between the first corner of the housingand the third corner of the housing, a second driving magnet disposedbetween the third corner of the housing and the second corner of thehousing, a third driving magnet disposed between the second corner ofthe housing and the fourth corner of the housing, and a fourth drivingmagnet disposed between the first corner of the housing and the fourthcorner of the housing, and wherein a distance between the first drivingmagnet and the fourth driving magnet is greater than a distance betweenthe first driving magnet and the second driving magnet.
 2. The lensdriving device of claim 1, wherein a distance between the first drivingmagnet and the first corner of the housing is greater than a distancebetween the first driving magnet and the third corner of the housing. 3.The lens driving device of claim 2, wherein a distance between thesecond driving magnet and the second corner of the housing is greaterthan a distance between the second driving magnet and the third cornerof the housing.
 4. The lens driving device of claim 3, wherein the thirddriving magnet is disposed at a position symmetrical to that of thefirst driving magnet with respect to an optical axis, and wherein thefourth driving magnet is disposed at a position symmetrical to that ofthe second driving magnet with respect to the optical axis.
 5. The lensdriving device of claim 1, comprising: a second magnet disposed on thebobbin; a substrate disposed on the housing; and a sensor coupled to thesubstrate and sensing the second magnet, wherein the sensor is disposedat a position corresponding to the first corner of the housing.
 6. Thelens driving device of claim 1, comprising: a third magnet disposed onthe bobbin, wherein the third magnet is disposed at a positionsymmetrical to that of the second magnet with respect to the opticalaxis.
 7. The lens driving device of claim 1, wherein the wire comprisesa first wire disposed at a position corresponding to the first corner ofthe housing, a second wire disposed at a position corresponding to thesecond corner of the housing, a third wire disposed at a positioncorresponding to the third corner of the housing, and a fourth wiredisposed at a position corresponding to the fourth corner of thehousing, and wherein a distance between the first driving magnet and thefirst wire is greater than a distance between the first driving magnetand the third wire.
 8. The lens driving device of claim 5, wherein theupper elastic member comprises six elastic units spaced apart from eachother.
 9. The lens driving device of claim 8, wherein two elastic unitsof the six elastic units are electrically connected to the first coil,and wherein four elastic units of the six elastic units are electricallyconnected to the sensor.
 10. The lens driving device of claim 8, whereinthe wire comprises at least six wires spaced apart from each other. 11.The lens driving device of claim 10, wherein two wires of the at leastsix wires are disposed at a position corresponding to the first cornerof the housing.
 12. The lens driving device of claim 1, wherein adistance between the third driving magnet and the second driving magnetis greater than a distance between the third driving magnet and thefourth driving magnet, and wherein a distance between the first drivingmagnet and the third driving magnet is same as a distance between thesecond driving magnet and the fourth driving magnet.
 13. The lensdriving device of claim 1, comprising: a cover member comprising anupper plate and a lateral plate extending from the upper plate, whereinthe housing disposed in the cover member, and wherein the base iscoupled to the lateral plate of the cover member.
 14. A camera module,comprising: a printed circuit board; an image sensor disposed on theprinted circuit board; the lens driving device of claim 1; and a lenscoupled to the bobbin of the lens driving device and disposed at aposition corresponding to that of the image sensor.
 15. A mobile phonecomprising the camera module of claim
 14. 16. A lens driving device,comprising: a housing; a bobbin disposed in the housing; a base spacedapart from the housing; a first coil disposed on the bobbin; a firstmagnet disposed on the housing; a circuit board disposed on the base andcomprising a second coil facing the first magnet; a second magnetdisposed on the bobbin; a substrate disposed on the housing; a sensorcoupled to the substrate and sensing the second magnet; an upper elasticmember connecting the bobbin and the housing; and a plurality of wiresconnecting the circuit board and the upper elastic member, wherein theplurality of wires comprises a first wire disposed at a positioncorresponding to a first corner of the housing, a second wire disposedat a position corresponding to a second corner of the housing, a thirdwire disposed at a position corresponding to a third corner of thehousing, and a fourth wire disposed at a position corresponding to afourth corner of the housing, wherein the first corner of the housing isdisposed opposite to the second corner of the housing and the thirdcorner of the housing is disposed opposite to the fourth corner of thehousing, wherein the first magnet comprises a first driving magnetdisposed between the first corner of the housing and the third corner ofthe housing, and wherein a distance between the first driving magnet andthe first corner of the housing is greater than a distance between thefirst driving magnet and the third corner of the housing.
 17. The lensdriving device of claim 16, wherein the first magnet comprises a seconddriving magnet disposed between the third corner of the housing and thesecond corner of the housing, and wherein a distance between the seconddriving magnet and the second corner of the housing is greater than adistance between the second driving magnet and the third corner of thehousing.
 18. The lens driving device of claim 17, wherein the firstmagnet comprises a third driving magnet disposed between the secondcorner of the housing and the fourth corner of the housing, and a fourthdriving magnet disposed between the first corner of the housing and thefourth corner of the housing, wherein the third driving magnet isdisposed at a position symmetrical to that of the first driving magnetwith respect to an optical axis, and wherein the fourth driving magnetis disposed at a position symmetrical to that of the second drivingmagnet with respect to the optical axis.
 19. The lens driving device ofclaim 16, comprising: a third magnet disposed on the bobbin, wherein thethird magnet is disposed at a position symmetrical to that of the secondmagnet with respect to the optical axis.
 20. A lens driving device,comprising: a housing; a bobbin disposed in the housing; a base spacedapart from the housing; a first coil disposed on the bobbin; a firstmagnet disposed on the housing; a circuit board disposed on the base andcomprising a second coil facing the first magnet; an upper elasticmember connecting the bobbin and the housing; and a wire connecting thecircuit board and the upper elastic member.